Numerical - Average dc output voltage of a chopper with ON time of 20ms and OFF time of 15 ms

Q.  What will be the average dc output voltage of a chopper which is supplied by 500 V dc with ON time of 20ms and OFF time of 15 ms?
- Published on 20 Oct 15

a. 150 V
b. 230 V
c. 285 V
d. 325 V

ANSWER: 285 V
 
According to given data,

TON = 20 ms = 20 x 10 -3 s

TOFF = 15 ms = 15 x 10 -3 s

T = TON + TOFF

T = (20 x 10 -3 + 15 x 10 -3 ) = 35 x 10-3 s

Therefore, duty cycle of the chopper is given by,

T = TON / T = 20 x 10 -3 / 35 x 10-3 = 0.57

Thus, average dc output voltage of chopper can be evaluated by,

VL = Vdc x duty cycle = 500 x 0.57 = 285 V

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